How to check if a string contains a specific text

Question

lt  php  a        if  a exist  some text       echo  text     gt    Suppose I have the code above  how to write the statement  if  a exist  some text

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http   php net manual en function strpos php  I think you are wondiner if  some text  exists in the string right   if strpos   a    some text        false

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You can use the    comparison operator to check if the variable is equal to the text   if   a     some text               You can also use strpos function to return the first occurrence of a string    lt  php  mystring    abc    findme      a    pos   strpos  mystring   findme       Note our use of       Simply    would not work as expected    because the position of  a  was the 0th  first  character  if   pos     false        echo  The string   findme  was not found in the string   mystring      else       echo  The string   findme  was found in the string   mystring        echo   and exists at position  pos       See documentation

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You can use strpos   or stripos   to check if the string contain the given needle  It will return the position where it was found  otherwise will return FALSE   Use the operators     or       to differ FALSE from 0 in PHP

User · Answer

Empty strings are falsey  so you can just write   if   a        echo  text       Although if you re asking if a particular substring exists in that string  you can use strpos   to do that   if  strpos  a   some text       false        echo  text

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Use the strpos function  http   php net manual en function strpos php  haystack    quot foo bar baz quot    needle      quot bar quot    if  strpos   haystack   needle       false        echo  quot   quot bar  quot  exists in the haystack variable quot      In your case  if  strpos   a   some text        false   echo  text    Note that my use of the     operator  instead of    false or    true or even just if  strpos             is because of the  quot truthy quot   quot falsy quot  nature of PHP s handling of the return value of strpos  As of PHP 8 0 0 you can now use str contains  lt  php     if  str contains  abc                  echo  quot Checking the existence of the empty string will always          return true quot

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you can use this code   a        if  empty  a     echo  text

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Do mean to check if  a is a non-empty string  So that it contains just any text  Then the following will work   If  a contains a string  you can use the following   if   empty  a             Means  if not empty             If you also need to confirm that  a is actually a string  use   if  is string  a   amp  amp   empty  a             Means  if  a is a string and not empty

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If you need to know if a word exists in a string you can use this  As it is not clear from your question if you just want to know if the variable is a string or not  Where  word  is the word you are searching in the string   if  strpos  a  word       false    echo  true       or use the is string method  Whichs returns true or false on the given variable    lt  php  a       is string  a     gt

[php] How to check if a string contains a specific text

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